CN114325816A - A downhole detection device - Google Patents

Abstract

An underground detection device provided by the application belongs to the technical field of optical fiber sensing, and includes: a photoelectric hybrid cable, a downhole pusher and a detector assembly, and the optoelectronic hybrid cable is supported and connected to the downhole pusher; wherein: the downhole pusher includes a connecting subsection and a Several test short sections, one end of the optoelectronic hybrid cable is connected to one end of the connecting short section, and the other end of the connecting short section is connected to the test short section in turn; the test short section is provided with a pusher and a detector installation section, The pusher is electrically connected to the optoelectronic hybrid cable through a first cable, so as to be controlled to support the detector installation section; the detector assembly includes an armored optical cable and a plurality of optical fiber detectors, the optical fiber detectors The photoelectric hybrid cable is optically connected through the armored optical cable; the optical fiber detector is correspondingly arranged on the detector installation section. The downhole detection device provided in the present application realizes the use of the fiber grating detector in the oil well environment, so as to facilitate the measurement of the oil well downhole vibration signal.

Description

A downhole detection device

technical field

The present application relates to the technical field of optical fiber sensing, and in particular, to a downhole detection device.

Background technique

With the continuous development of oil, oil exploration technology is becoming more and more important. In the process of oil extraction, it is necessary to detect the temperature, pressure and vibration of the oil well. At present, there are various monitoring devices used for vibration detection in mines, rocks, and railways. For example, fiber grating detectors are used for vibration detection in mines, rocks, and railways.

Fiber Bragg grating detector is an instrument that uses optical fiber to respond to external changes sensitively, and its output optical parameters change with the seismic wave signal, and detect seismic waveforms by detecting changes in optical parameters. Compared with traditional piezoelectric sensors, fiber grating detectors have the advantages of wide frequency band, high sensitivity, and immunity to electromagnetic interference. However, the environment of oil wells is very different from mines, rocks, and railways. The depth can range from tens of meters to several kilometers. The underground environment is relatively harsh, such as high temperature, high pressure, vibration and corrosive fluids, which are not convenient for optical fibers. The downhole and use of the grating detector.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a downhole detection device, which realizes the use of a fiber grating detector in the environment of oil wells, so as to facilitate the measurement of vibration signals in oil wells.

The application provides a downhole detection device, comprising: an optoelectronic hybrid cable, a downhole pusher and a detector assembly, the optoelectronic hybrid cable supports and connects the downhole pusher; wherein:

The downhole pusher includes a connecting short section and several test short sections, one end of the optoelectronic hybrid cable is connected to one end of the connecting short section, and the other end of the connecting short section is connected to the test short section in turn; the test short section A pusher and a detector installation section are arranged on the short section, and the pusher is electrically connected to the optoelectronic hybrid cable through a first cable, so as to be controlled to support the detector installation section;

The detector assembly includes an armored optical cable and a plurality of optical fiber detectors, and the optical fiber detectors are optically connected to the optoelectronic hybrid cable through the armored optical cable;

The optical fiber detector is correspondingly arranged on the detector installation section.

Optionally, in the above-mentioned downhole detection device, a first groove is provided on the test sub, and the optical fiber detector is provided in the first groove.

Optionally, in the above-mentioned downhole detection device, the optoelectronic hybrid cable includes an optical fiber, a wire and a wrapping layer, and the wrapping layer wraps the optical fiber and the wire; the wire is located on the periphery of the optical fiber, and the The optical fiber is wrapped with a stainless steel tube, the wire is wrapped with polyperfluoroethylene propylene, and the outer layer of the wrapping layer is wrapped with a steel wire layer.

Optionally, in the above-mentioned downhole detection device, the connecting short section includes a tap and a connector installation section; the optoelectronic hybrid cable is connected to the tap and is divided into a second cable and an optical cable through the tap, so The second cable is electrically connected to the first cable, and the optical cable is optically connected to the armored optical cable through a first connector, and the first connector is fixed on the connector installation section.

Optionally, in the above-mentioned downhole detection device, a second groove and a through hole are arranged on the connector installation section, the second groove communicates with the through hole, and the connector is arranged in the second groove. inside, the optical cable is arranged in the through hole.

Optionally, in the above-mentioned downhole detection device, the first cable includes a wire and a steel wire layer, and the steel wire layer wraps the wire.

Optionally, in the above-mentioned downhole detection device, the steel wire layer includes a first steel wire layer and a second steel wire layer, and the steel wire diameter of the first steel wire layer is smaller than the steel wire diameter of the second steel wire layer.

Optionally, in the above-mentioned downhole detection device, a second connector is provided on the optical fiber detector, and the optical fiber detector is optically connected to the armored optical cable through the second connector.

Optionally, in the above-mentioned downhole detection device, the armored optical cable is fixedly connected to the connection sub-section or the test sub-section through a pressing block.

Optionally, in the above-mentioned downhole detection device, the two ends of the test sub-section are tapered and the middle is cylindrical; the two ends of the connecting sub is tapered and the middle is cylindrical.

The beneficial effects of this application are:

The application provides a downhole detection device. The optoelectronic hybrid cable, the connecting subsection and the test subsection are connected in sequence, and the optical fiber detector is optically connected to the optoelectronic hybrid cable through the armored optical cable, and the optical fiber detector is arranged in the detector installation section of the test subsection. On the upper side, the optoelectronic hybrid cable is connected, and the pusher of the test nipple is electrically connected to the optoelectronic hybrid cable through the first cable, so that the transmission of electrical signals and optical signals can be realized through the optoelectronic hybrid cable. In the present application, the subsection of the downhole detection device is realized by connecting the connecting sub and the test sub in sequence, which facilitates the downhole operation of the downhole detection device. In addition, there is a pusher on the test sub. By controlling the pusher by power supply, the outer edge of the test sub can be closely attached to the well wall, and the rigid coupling contact between the optical fiber detector and the well wall is realized, which is convenient for the optical fiber detector to vibrate downhole in oil. The measurement of the signal is convenient to realize the use of the fiber grating detector in the oil well environment.

Description of drawings

In order to illustrate the technical solutions of the present application more clearly, the accompanying drawings that need to be used in the embodiments will be briefly introduced below. Other drawings can also be obtained from these drawings.

1 is a schematic structural diagram of a downhole detection device according to an embodiment of the present application;

2 is a schematic cross-sectional structure diagram of an optoelectronic hybrid cable provided by an embodiment of the application;

3 is a schematic structural diagram of a connecting short section provided by an embodiment of the present application;

FIG. 4 is a schematic structural diagram of a test short section provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Oil wells are holes drilled according to the well layout system planned for oilfield development for oil extraction. Oil rises from the bottom of the well to the wellhead. In order to ensure the safety of oil extraction, the detection of temperature, pressure, vibration, etc. A necessary process in the mining process. In order to facilitate the use of the fiber grating detector in the downhole environment, an embodiment of the present application provides a downhole detection device.

FIG. 1 is a schematic structural diagram of a downhole detection device provided by an embodiment of the present application, and FIG. 1 shows the structure of the downhole detection device provided by an embodiment of the present application from a principle structure. As shown in FIG. 1 , the downhole detection device provided in the embodiment of the present application includes an optoelectronic hybrid cable 10 , a downhole pusher 20 and a detector assembly 30 , and the optoelectronic hybrid cable 10 is connected to the downhole pusher 20 and the detector assembly 30 .

During the use of the downhole detection device provided in the embodiment of the present application, the optoelectronic hybrid cable 10 is used to provide power supply control to the downhole pusher 20 and inject optical signals into the detector assembly 30, so the optoelectronic hybrid cable 10 is electrically connected to the downhole pusher 20, The detector assembly 30 is optically connected, and the optoelectronic hybrid cable 10 is also used to hoist and support the downhole pusher 20 and the detector assembly 30 . Therefore, the optoelectronic hybrid cable 10 not only has the function of transmitting electrical signals and optical signals, but also has good properties of tensile strength, temperature resistance and voltage resistance.

As shown in FIG. 1 , the downhole pusher 20 includes a connecting nipple 21 and several test nipples 22 , the connecting nipple 21 is connected to the optoelectronic hybrid cable 10 , and the connecting nipple 21 and several test nipples 22 are connected by cables in sequence. In some embodiments of the present application, the connecting sub-section 21 and the test sub-section 22 and the test sub-section 22 are respectively connected through a first cable 23. On the one hand, the first cable 23 provides the connection sub-section 21, the test sub-section 22 and the test sub-section 23. The hoisting support between the nipples 22, on the other hand, supplies the test nipples 22 with power.

As shown in FIG. 1, the detector assembly 30 includes an armored optical cable 31 and several optical fiber detectors 32. The armored optical cable 31 is optically connected to the optoelectronic hybrid cable 10, and the optical fiber detector 32 is connected to the armored optical cable 31 through the armored optical cable. 31 receives the optical signal transmitted by the optical-electrical hybrid cable 10 . In FIG. 1, although the test sub-section 22 is separated from the optical fiber detector 32, the fiber-optic detector 32 is correspondingly arranged on the test sub-section 22 when the downhole detection device goes down and works, and the test sub-section 22 is used to facilitate the optical fiber detection The downhole of the detector 32 and the protection of the fiber optic detector 32.

In the embodiment of the present application, the size of the connecting sub-section 21 and the test sub-section 22 is much larger than the size of the optical fiber detector 32, so it is only shown in principle in FIG. 1 .

In some embodiments of the present application, the number of fiber detectors 32 may be 8, and the fiber detectors 32 may be connected in series or in parallel, and may also be divided into several series groups, and the series groups are connected in parallel, or may also be divided into several groups. Parallel groups, series connection between parallel groups, etc.; the specific connection can be selected according to actual needs. Usually, the number of fiber optic detectors 32 is the same as the number of test subs 22, and each fiber detector 32 is arranged on one test stub 22, so that a plurality of fiber detectors 32 are arranged in the oil well, thereby facilitating in-well testing Accurate acquisition of signals.

FIG. 2 is a schematic cross-sectional structure diagram of an optoelectronic hybrid cable according to an embodiment of the present application. As shown in FIG. 2 , in some embodiments of the present application, the optoelectronic hybrid cable 10 includes an optical fiber 11 , the outer layer of the optical fiber 11 is wrapped with a stainless steel tube 12 , and the optical fiber 11 is passed through the stainless steel tube 12 ; the stainless steel tube 12 is used as the optical fiber 11 Armored, and then the optical fiber 11 and the stainless steel tube 12 form an armored optical cable, so as to facilitate the protection of the optical fiber 11 and improve the tensile strength of the optoelectronic hybrid cable 10. Optionally, the optical fiber 11 can be an optical fiber of 16 cores or the like, and the stainless steel tube 12 can be selected from a stainless steel tube with a specification of 3*0.3.

The outer layer of the stainless steel tube 12 is provided with several strands of wires 13 , and the outer layer of the wires 13 is wrapped with a polyperfluoroethylene propylene layer 14 . Of course, the outer wrapping of the wire 13 is not limited to the polyperfluoroethylene propylene layer 14, and other insulating materials can also be used to form a wrapping layer. Optionally, as shown in FIG. 2 , the outer layer of the stainless steel tube 12 is provided with 7-strand wires 13, but the embodiment of the present application is not limited to the 7-strand wires 13, the wires 13 are evenly arranged on the outside of the stainless steel tube 12, and the A stainless steel tube 12 surrounds the center.

As shown in FIG. 2 , the outer edge of the wire 13 is provided with a wrapping layer 15 , and the wrapping layer 15 wraps the wire 13 and the stainless steel tube 12 tightly and roundly together. The wrapping layer 15 can make the wire into a cylindrical shape during the use of the cable to prevent the wire from loosening; the wrapping layer 15 can also be used for thermal insulation of the wire 13 and the stainless steel tube 12, and the polyperfluoroethylene propylene layer 14. Anti-corrosion and anti-aging, etc.; Therefore, it is convenient to ensure the use performance of the optoelectronic hybrid cable 10 .

Further, as shown in FIG. 2 , the outer layer of the wrapping layer 15 is wrapped with a steel wire layer 16 , and the steel wire layer 16 is formed by winding the steel wire to further improve the tensile performance of the optoelectronic hybrid cable 10 . In some embodiments of the present application, the steel wire layer 16 includes several steel wire layers formed of different steel wire diameters. As shown in FIG. 2 , the steel wire layer 16 includes a first steel wire layer 161 and a second steel wire layer 162 . The first steel wire layer 161 contacts and wraps the wrapping layer 15 , and the second steel wire layer 162 contacts and wraps the first steel wire layer 161 . The first steel wire layer 161 is located inside the second steel wire layer 162 in the direction shown in FIG. 2 . In the embodiment of the present application, the steel wire layer 16 is not limited to include the first steel wire layer 161 and the second steel wire layer 162 , and may further include more layers according to the strength requirements of the electric hybrid cable 10 .

In some embodiments of the present application, the diameter of the steel wires in the first steel wire layer 161 is smaller than the diameter of the steel wires in the second steel wire layer 162 . Optionally, the diameter of the steel wire in the first steel wire layer 161 is 1 mm, and the diameter of the steel wire in the second steel wire layer 162 is 1.26 mm. The diameter is not limited to this, and can be selected according to actual needs.

FIG. 3 is a schematic structural diagram of a connecting short section provided by an embodiment of the present application, and FIG. 3 shows a basic structure of the connecting short section 21 and a use state of the connecting short section 21 . As shown in FIG. 3 , in some embodiments of the present application, the connecting short section 21 includes a faucet 211 and a connector installation section 212 ; one end of the faucet 211 is connected to the optoelectronic hybrid cable 10 , and the other end of the faucet 211 is connected to the connector installation paragraph 212. The end of the optoelectronic hybrid cable 10 is inserted into the faucet 211 to connect the short section 21 in a fixed manner. At the same time, the optoelectronic hybrid cable 10 enters the faucet 211 for photoelectric separation through the faucet 211, that is, the wires and the optical fibers in the end of the optoelectronic hybrid cable 10 are separated. , the bundle is divided into wires and optical cables; the wires separated from the optoelectronic hybrid cable 10 are electrically connected with the first cable 23 , and the first cable 23 passes through the connector installation section 212 . The optical cable separated from the optical-electric hybrid cable 10 is optically connected to the armored optical cable 31 . Optionally, the optical cable separated from the optoelectronic hybrid cable 10 is optically connected to the armored optical cable 31 through the first connector 33, which is an existing optical cable connection device, and the optoelectronic hybrid can be realized through the first connector 33. The connection strength of the optical cable in the cable 10 and the armored optical cable 31 and the optical fiber in the optical fiber cable in the optoelectronic hybrid cable 10 and the optical fiber in the armored optical cable 31 can be sealed and protected, so that the optical fiber in the cable is not affected by the harsh underground environment.

In some embodiments of the present application, a through hole 213 is formed on the faucet 211 , a second groove 214 is formed on the connector mounting section 212 , and the through hole 213 communicates with the second groove 214 . The split optical cable in the optoelectronic hybrid cable 10 extends into the second groove 214 along the through hole 213, the first connector 33 is arranged in the second groove 214, and the split optical cable in the optoelectronic hybrid cable 10 is connected through the first connection The connector 33 is connected to the armored optical cable 31 . Optionally, the armored optical cable 31 is attached to the outer wall of the connector installation section 212 and the outer wall of the first cable 23; The course of a cable 23 is arranged closely. The first cable 23 may be a cable with an overall diameter of 11.8 mm.

In some embodiments of the present application, both ends of the connecting short joint 21 are tapered, and the middle is cylindrical, so as to facilitate connecting the short joint 21 to go down well, thereby facilitating the use of the downhole detection device.

FIG. 4 is a schematic structural diagram of a test sub section provided by an embodiment of the present application. FIG. 4 shows two test sub sections, and FIG. 4 shows the basic structure of the test sub section 22 and the use state of the test sub section 22 . As shown in FIG. 4 , in some embodiments of the present application, the two test short sections 22 are connected in sequence through the first cable 23 ; the test short section 22 is provided with a pusher 221 and a detector installation section 222 . The pusher 221 is electrically connected to the first cable 23, and the pusher 221 is an electric pusher; during the use of the downhole detection device, the pusher 221 is controlled by power supply, and the pusher 221 pushes against the side well wall to detect the wave The device mounting section 222 is pushed against the other side of the well wall. The detector installation section 222 is used to carry the optical fiber detector 32, and when the pusher 221 pushes against one side of the well wall, the rigid contact between the outer edge of the test sub 22 and the well wall can be realized, which is convenient for the optical fiber detector 32 The downhole vibration is induced to realize the rigid coupling contact between the optical fiber detector 32 and the wellbore wall, thereby ensuring that the downhole detection device can accurately measure the downhole vibration signal.

In some embodiments of the present application, the detector installation section 222 is provided with a first groove 223, and the optical fiber detector 32 is arranged in the first groove 223, so that the installation and fixation of the optical fiber detector 32 on the test sub-section 22 is convenient, At the same time, the first groove 223 can also protect the optical fiber detector 32 .

In some embodiments of the present application, both ends of the test sub-section 22 are tapered and the middle is cylindrical, so that the test sub-section 22 can go down well, thereby facilitating the use of the downhole detection device.

In some embodiments of the present application, the first cable 23 includes a wire and a steel wire layer, and the steel wire layer wraps the wire; the wire is located in the center. The first cable 23 has good tensile strength, temperature resistance and pressure resistance, so as to not only meet the power supply control requirements of the pusher 221, but also provide sufficient hoisting support requirements.

In some embodiments of the present application, the test nipple 22 is further provided with a tap, and the tap is used to facilitate the connection between the test nipple 22 and the first cable 23 and the electrical connection between the pusher 221 and the first cable 23 . One end of the faucet is connected to the first cable 23, and the other end is connected to the detector installation section 222. The first cable 23 is inserted into the faucet to fixedly connect the test nipple 22, and at the same time, the first cable 23 enters the faucet and is divided into bundles through the faucet. , on the one hand, it is convenient to realize the connection between the first cable 23 and the test short section 22 , and on the other hand, it is convenient for the electrical connection between the first cable 23 and the pusher 221 . Optionally, the pusher 221 is connected to the first cable 23 through a plug.

In some embodiments of the present application, the fiber optic detector 32 is connected to the armored cable 31 through the second connector 34 . The second connector 34 is an existing optical cable connection device. The second connector 34 can ensure the connection strength of the optical fiber detector 32 and the armored optical cable 31 and ensure that the optical fiber in the optical fiber detector 32 and the armored optical cable 31 can be sealed Protection, so that the optical fiber in it is not affected by the harsh environment in the well. Optionally, the second connector 34 is fixed on the first cable 23 between the test nipples 22 , so that the armored optical cable 31 is in close contact with the direction of the first cable 23 .

In the embodiment of the present application, the armored optical cable 31 is arranged in close contact with the outer wall connecting the short section 21 and the test short section 22. In order to facilitate installation, the length of the armored optical cable 31 between the test short sections 22 is greater than that between the test short sections 22. The length of the cable ensures that the armored optical cable 31 and the optical fiber for connecting the optical fiber detector 32 are not under tension.

In the downhole detection device provided by the present application, by setting the downhole pusher 20 in the form of connecting the sub joint 21 and the test subsection 22, it can realize that the downhole pusher 20 is separated into short joints before going downhole, that is, each short joint can be separated. The connecting cables between and are separated; and the optical fiber detector 32 and the armored optical fiber cable 31 in the detector assembly 30 are connected and fixed in series. In the following, the use of the downhole detection device is explained by taking the detector assembly 30 including 8 optical fiber detectors 32 as an example; wherein, when the detector assembly 30 includes 8 fiber detectors 32, the downhole pusher 20 will include 8 test detectors. The sub section 22, which is pushed from bottom to top and downhole 20, includes the first section test sub section, the second section test sub section...the eighth section test sub section.

Before going downhole, firstly connect the optoelectronic hybrid cable 10 with the tap 211 in the connecting short section 21 in the downhole pusher 20, and at the same time separate the optical cable in the optoelectronic hybrid cable 10 from the wire, and the wire and the downhole pusher 20 On the wire plug connection, the optical cable is passed through the through hole in the tap and the connecting nipple groove, leaving a good margin. When going down the well, first go down the lowest fiber detector 32 and the first test sub, first connect the first test sub to the first cable, and then install the corresponding fiber detector 32 on the first test sub, Use a crane to hoist the cable down the well, and at the same time lower the fiber optic detector 32 to a suitable position; then connect the second test subsection and the first cable, and install the corresponding fiber detector 32 to the second test section. Section, use a crane to lift the cable down the well, and lower it to a suitable position; repeat the operation until the eighth test sub section is lowered to a suitable position with the corresponding fiber optic detector 32. Connect the first cable to the connecting nipple 21 (the connecting nipple is fixed on the optoelectronic hybrid cable), and the armored optical cable 31 in the detector assembly 30 is connected to the optoelectronic hybrid cable 10 on the connecting nipple 21 through the first connector 33 For optical fiber connection, the first connector 33 is fixed and installed, and then the connecting short section 21 is lowered into the well. When the entire structure is lowered into the well to the required depth, power is supplied to the downhole pusher, the pusher 221 works, and the pusher is close to The shaft wall realizes the rigid contact between the fiber optic detector 32 and the shaft wall, and then pump light is injected into the fiber optic detector 32, and a vibration signal is released on the ground through the vibration source, and the vibration signal is transmitted to the shaft wall through the ground. The signal optical fiber detector 32 and the optical fiber detector 32 collect the vibration signal, and then feed it back to the ground demodulation system, thereby realizing the measurement of the vibration signal in the oil well.

Finally, it should be noted that: the present embodiment is described in a progressive manner, and different parts can be referred to each other; in addition, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; After a detailed description, those of ordinary skill in the art should understand that: it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some of the technical features; and these modifications or replacements do not make the corresponding The essence of the technical solutions deviates from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A downhole detection device, characterized in that it comprises: a photoelectric hybrid cable, a downhole pusher and a detector assembly, and the photoelectric hybrid cable supports and connects the downhole pusher; wherein: The downhole pusher includes a connecting short section and several test short sections, one end of the optoelectronic hybrid cable is connected to one end of the connecting short section, and the other end of the connecting short section is connected to the test short section in turn; the test short section A pusher and a detector installation section are arranged on the short section, and the pusher is electrically connected to the optoelectronic hybrid cable through a first cable, so as to be controlled to support the detector installation section; The detector assembly includes an armored optical cable and a plurality of optical fiber detectors, and the optical fiber detectors are optically connected to the optoelectronic hybrid cable through the armored optical cable; The optical fiber detector is correspondingly arranged on the detector installation section. 2 . The downhole detection device according to claim 1 , wherein a first groove is arranged on the detector installation section, and the fiber detector is arranged in the first groove. 3 . 3. The downhole detection device according to claim 1, wherein the optoelectronic hybrid cable comprises an optical fiber, a wire and a wrapping layer, and the wrapping layer wraps the optical fiber and the wire; the wire is located in the The outer periphery of the optical fiber is wrapped with a stainless steel tube, the wire is wrapped with a polyperfluoroethylene propylene layer, and the outer layer of the wrapping layer is wrapped with a steel wire layer. 4 . The downhole detection device according to claim 1 , wherein the connecting short section comprises a tap and a connector installation section; the optoelectronic hybrid cable is connected to the tap and is divided into bundles through the tap. 5 . A wire and an optical cable, the wire is electrically connected to the first cable, the optical cable is optically connected to the armored optical cable through a first connector, and the first connector is fixed on the connector installation section. 5 . The downhole detection device according to claim 4 , wherein a through hole is arranged on the faucet, a second groove is arranged on the connector installation section, and the second groove communicates with the through hole. 6 . , the connector is arranged in the second groove, and the optical cable is arranged in the through hole. 6 . The downhole detection device according to claim 1 , wherein the first cable comprises a wire and a steel wire layer, and the steel wire layer wraps the wire. 7 . 7. The downhole detection device according to claim 3, wherein the steel wire layer comprises a first steel wire layer and a second steel wire layer, the first steel wire layer contacts the wrapping layer and the first steel wire layer The wire diameter of the layer is smaller than the wire diameter of the second wire layer. 8 . The downhole detection device according to claim 1 , wherein a second connector is provided on the optical fiber detector, and the optical fiber detector is optically connected to the armored optical cable through the second connector. 9 . 9 . The downhole detection device according to claim 1 , wherein the armored optical cable is fixedly connected to the connection sub-section or the test sub-section through a pressing block. 10 . 10 . The downhole detection device according to claim 1 , wherein the two ends of the test sub-section are in a conical shape and the middle is in a cylindrical shape; the two ends of the connecting sub-section are in a conical shape and the middle is in a cylindrical shape .

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